Abrading device



Aug. 2, 1966 R. c. COLLINS ABRADING DEVICE Filed June 18, 1964 INVENTOR.

\ ROBERT C. COLLINS chuck 2 of a power tool.

3,263,666 ABRADING DEVICE Robert C. Coilins, 746 NE. 67th St., Miami,Fla. Filed June 18, 1964, Ser. No. 376,042 Claims. (Cl. 125-5) Thisinvention in general relates to abrading devices and more particularlyto an abrading attachment for a power driven drill.

The present invention shows and describes certain improvements toapplicants prior application for Power Driven Abrading Tool, SerialNumber 339,387, filed January 22, 1964, which improvements relate ingeneral to simplification in construction and the addition of guards onthe device for protecting objects lateral to the surface being abradedand also to protect the user from flying debris.

A principal object of the invention is the provision of an abradingdevice having a plurality of radially journalled abrading discs rotatedabout axes in a plane normal to the rotation of a common drive axis andincluding a circular guard member surrounding the abrading discs.

Another object of the invention is the provision of a disc-like guardsecured to the axis of power rotation of the abrading device whichrotates in a plane parallel the rotation of the axes of the abradingdiscs for intercepting and deflecting abraded debris propelled by saiddiscs.

An alternate construction embraces a plurality of axles radiallyequi-spaced in a plane normal to an axis of rotation, which axles areslidably retained in a separate bore in a toroidal socket by a bandcontracted and retained about the outer ends of said axis.

These and other objects and advantages in two embodiments of theinvention are shown and described in the appended specification anddrawing, in which:

FIG. 1 is a side elevation of the abrading device.

FIG. 2 is a bottom plan view of the device shown in FIG. 1.

FIG. 3 is a cross sectional side elevation taken through section line3-3, FIG. 2.

FIG. 4 is a bottom plan view of a construction alternate to that shownin FIG. 1.

FIG. 5 is an enlarged fragmentary cross sectional view of the deviceshown in FIG. 4.

Referring to FIGS. 1, 2, and 3, a shank member 1 is intended to besecured in and rotated by a conventional The shank 1 has an enlargedlower end 3 threaded to engage the upper end portion of a conical spring4, as shown. The lower end of spring 4 is threaded into the bore of atoroidal collar 5. Five axles 6 are threaded in equi-spaced radialrelation to the axis of collar 5, as shown. Each axle 6 has journalledthereon three toothed abrading discs 7, which are spaced by washer-likespacers 8. The outer end of each axle 6 is provided with a transverse Vgroove 9 for retaining a pretensioned guard ring 10 sprung therein.

Referring to FIGS. 1 and 3, a guard disc 11 is snugly threaded coaxialto the outside of the upper portion of spring 4, as shown, which discextends normal to the axis of rotation of the device for interceptingand deflecting abraded products from traveling in an upward direction.

The alternate construction, shown in FIGS. 4 and 5, involves only theaxles 6a and the guard band 10a. The axles 6a are slidably secured inseparate bores 12 in collar 5a, better shown in FIG. 5. The band 10a hasholes in offsets 13 for retention on five of the axles 6a. The masteraxle 6am is provided with a recess at the outer end thereof for aC-washer 14, which retains the ends of the band 10a, which has elongatedholes for engaging axle 6 am, as shown in full lines in FIG. 5. Thedotted United States Patent 0 3,263,666 Patented August 2, 1966 lines inFIG. 5 show the position of one of the ends of band 10a prior to itssprung engagement on the master axle.

In operation, it is apparent from FIG. 1 that when the chuck 2 isrotated, the discs 7 will contact and abrade a surface substantiallynormal to the axis of rotation. It is apparent that lateral angulardeviations from the normal axis of rotation will be compensated by theuniversal fiex of the spring 4 and it is also apparent that the productsof abrasion will be deflected and prevented from upward trajectories.

The replacement of the abrading discs 7 in the device shown in FIG. 1 isaccomplished by the mere forceful springing of guard ring 10 off andonto the V grooves in the axles 6.

It is apparent that the axles 6, when threaded into the collar 5, willaid in securing the lower portion of the spring in the collar 5;however, when the axles 6 require replacement, they must be individuallyunthreaded from and rethreaded into the collar 5.

In the alternate construction, shown FIGS. 4 and 5, the replacement ofboth the abrading discs and their axles may be accomplished by removingC Washer 14 from axle 6am and springing the band from the ends of theaxles which permits the slidable removal and replacement of both discsand axles.

It is understood that certain modifications in the construction,utilizing the features above described, are intended to come within thescope of the appended claims.

Having described my invention, I claim:

1. A rotary abrading device adapted to be rotated by a chuck comprisinga circular body member having a coaxial bore therein,

a plurality of axles in said member extending outward and equi-distanttherefrom with the axes thereof normal and coplanar to the axis of saidbore and positioned radially thereto,

a transverse groove in the outer end of each of said axles,

a like plurality of abrading discs journalled for rotation on each ofsaid axles,

a resilient ring tensioned around the ends of said axles in each of saidgrooves for retaining said axles and said discs thereon on said member,

a spring means having one end portion thereof secured in said bore andterminating at the opposite end in a shank coaxial with said bore andadapted to be secured in said chuck.

2. In a rotary device of the character described, a ring forming a bodywith a coaxial threaded bore therein for receiving a spring means,

said body having a plurality of like equi-spaced bores in the outerperiphery thereof having coplanar axes positioned normal and radial withrespect to the axis of said threaded bore,

a like plurality of axles slidably retained in said bores,

a predetermined number of abrading discs journalled for rotation on eachof said axles, said discs being positioned around the outer periphery ofsaid body,

a single non-continuous resilient guard ring tensioned around the end ofsaid axles for retaining same in said bores and said abrading discs onsaid axles,

a spring means threaded into said bore for rotating said body whendriven.

3. In a rotary abrading device of the character described a body memberhaving a coaxial bore therein,

a plurality of axles in said member extending outward and equi-distanttherefrom with the: axes in coplanar relation normal to and radial withrespect to the axis of said bore,

a predetermined number of abrading discs journalled for rotation on eachof said axles, said discs being positioned around the outer periphery ofsaid body member,

guard means on said axles for retaining same on said body,

a coil spring means having one end portion thereof coaxially secured insaid bore,

a shank means coaxially secured to the opposite end portion of saidspring means whereby said spring will permit angular deviation betweenthe axis of said shank and said bore when said body is driven by saidshank.

4. The construction recited in claim 3 including a circular guard discsecured to said shank coaxial therewith positioned normal to the axisthereof for deflecting products of abrasion when said device isoperated, said spring means being located between said abrading discsand said guard discs.

5. A rotary abrading device adapted to be rotated by a chuck comprisinga circular body member having a coaxial bore therein,

a plurality of axles including a master axle secured in said member andextending outward and equi-distant therefrom with the axes thereofnormal and coplanar to the axis of said bore and positioned radiallythereto,

a like plurality of abrading discs journalled for rotation on each ofsaid axles,

a circular guard band having a plurality of holes therein for engagementby the ends of said axles,

the opposite ends of said band lapped over each other and on the end ofsaid master axle and retained thereon by a fastener means associatedwith said master axle for retaining said discs on said axles,

a spring means having one end portion thereof secured in said bore andterminating at the opposite end in a shank coaxial with said bore andadapted to be secured in said chuck.

References Cited by the Examiner UNITED STATES PATENTS 334,595 1/1886Maloy 1255 1,230,842 6/1917 Berg 1255 1,337,537 5/1921 Wimmer 125-31,581,699 4/1926 Sturrock 1255 2,439,921 4/1948 Brown 306-20 HAROLD D.WHITEHEAD, Primary Examiner.

1. A ROTARY ABRADING DEVICE ADAPTED TO BE ROTATED BY A CHUCK COMPRISINGA CIRCULAR BODY MEMBER HAVING A COAXIAL BORE THEREIN, A PLURALITY OFAXLES IN SAID MEMBER EXTENDING OUTWARD AND EQUI-DISTANT THEREFROM WITHTHE AXES THEREOF NORMAL AND COPLANAR TO THE AXIS OF SAID BORE ANDPOSITIONED RADIALLY THERETO, A TRANSVERSE GROOVE IN THE OUTER END OFEACH OF SAID AXLES, A LIKE PLURALITY OF ABRADING DISCS JOURNALLED FORROTATION ON EACH OF SAID AXLES, A RESILIENT RING TENSIONED AROUND THEENDS OF SAID AXLES IN EACH OF SAID GROOVES FOR RETAINING SAID AXLES ANDSAID DISCS THEREON ON SAID MEMBER, A SPRING MEANS HAVING ONE END PORTIONTHEREOF SECURED IN SAID BORE AND TERMINATING AT THE OPPOSITE END IN ASHANK COAXIAL WITH SAID BORE AND ADAPTED TO BE SECURED IN SAID CHUCK.